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The short circuit problem is a difficult issue in LLC converter. This paper derives the state-plane trajectory of the full-bridge LLC converter based on state-plane analysis and the characteristics of the trajectory performance are provided under short circuit mode. Two types of control scheme for power switches, respectively based on phase-shift frequency-boost and frequency-drop method, are deduced...
Renewable energy sources, such as solar energy and fuel cells, are desirable due to their pollution-free properties. In order to utilize the present infrastructure of the utility grid for power transmission and distribution, grid-connected inverters are required for distributed generation systems, which should have high reliability. However, a shoot-through problem, which is a major deterrent to the...
This paper presents a half-bridge-type inverter with hysteresis current control and unipolar modulation. The unipolar modulation strategy is adopted, thus the volume and weight of the output filter can be reduced compared with the conventional half-bridge inverter. In addition, as the voltage change during the switching process is just half of the input voltage, the switching losses can be reduced...
A dual-buck full-bridge inverter (DBFBI) is proposed. The inverter solves the shoot-through problem of each bridge leg which exists in bridge-type inverter, so the dead time between the switches neednpsilat be set, and thus waveform quality of the output voltage and reliability of the inverter can be improved. The DBFBI also increases the input-voltage utilization rate and reduces the voltage stresses...
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